Selective Reduction of NOx with Propene over SnO2/Al2O3 Catalyst
富氧条件下SnO2/Al2O3 催化剂上丙烯选择性还原NOx的研究

In the study, a series of SnO2/Al2O3 catalysts with various Sn loading were prepared by three different methods (impregnation, co precipitation and single step sol gel) and their catalytic activities for the selective reduction of NOx with propene were investigated. It was found that the catalyst preparation method as well as the Sn loading exerted a significant influence on the catalyst activity. Catalysts prepared by sol gel method exhibited the highest activity toward NO x reduction and the optimal Sn loading is 5%. 5%SnO2/Al2O3 catalyst prepared by sol gel method was found to be less inhibited by the presence of H2O than those prepared by other methods. Even in the co presence of H2O and SO2, it still showed the highest activity. The increase of oxygen and propene concentration promotes the NOx reduction, respectively.